Tracy,

If you are seeing clients, you should really understand who qualifies for which filing status.  Lots of material out there for free online, so you don't need to have lots of money to get yourself educated. 

At a minimum IRS Pub 17 is a great place to start.

For this current question, you may want to start here   

https://www.irs.gov/help/ita/what-is-my-filing-status